P04AEEVAP System Purge Control Valve B Performance Stuck Open
The EVAP purge valve B is mechanically stuck open or its feedback indicates flow even when commanded closed - vapor flows uncontrolled into the intake, disturbing fuel trim and idle quality.
Can I keep driving? With caution
You can drive to the shop, but do not postpone the repair. The problem may worsen and damage other components.
Sistema Afectado
Sistema de Escape · Catalizador y sensores O₂
La falla se localiza en la línea de escape: catalizador, sondas lambda (O₂) o sistema EGR.
Espacio para vendedores de repuestos
Aún no hay un anunciante en este espacio.
Symptoms You Will Notice
What you may observe when this code appears
- Check engine light on Possible smell of fuel near tank or engine bay Failed emissions inspection Loose-cap warning may appear
Possible Causes
The components or conditions that trigger this code
- 1Debris on valve seat prevents full closing Return spring weakened Carbon or debris buildup preventing free movement
How to Fix It — Step by Step
Recommended diagnostic and repair procedure
- 1Difficulty: easy. Estimated time: 0.6-1.5 hours. Estimated cost: €120-€
- 2DIY possible
Note: This information is for general reference. For precise diagnostics and safety repairs, always consult a certified mechanic.
Estimated Cost
Approximate range in USD (varies by region and shop)
Varies by diagnosis
* Diagnosis only: $50–$150
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